Improvement in burring-cylinders



P. G. & 'A.\O.VSARGENT.

Burr-111g Cylinder No. 207,441 Patented Aug. 27,1878.

14671208808: flwma fizw N. PEI'ERS, PNOTO-UTHOGRAPHER. WASHINGTON n, C.

UNITED STATES PATENT OFFICE.

FREDERICK G. SARGENT AND ALLAN O. SAItGENT, OF 'GRANITEVILLE,

' MASSACHUSETTS.

IMPROVEMENT IN BURRlNG-CYLINDERS.

Specification forming part of Letters Patent No. 207,447, dated August27, 1878; application filed June 8, 1878.

To all whom it may concern:

Be it known that we, FREDERICK G. SAR- GENT and ALLAN G. SARGENT, ofGraniteville, county of Middlesex, State of Massachusetts, have inventedcertain Improvements in Cylinders for Burring and Carding Machines, ofwhich the following is a specification:

Our invention relates to improvements in that class of burring-cylinderswhich consists of a toothed metal strip or wire seated in a grooved rollor cylinder; the invention consisting in providing the toothed stripwith a longitudinal groove, into which the metal of the cylinder isdepressed or upset for the purpose of holding the strip in place, theconstruction of the strip with a groove therein permitting the lines ofwire to be brought much closer together than is possible under theordinary mode of construction.

Grooved cylinders having the toothed strip wound therein have been incommon use for many years, the strip being made with a flange on one orboth sides at the base, and secured by forcing the metal down thereon.Under this mode of construction great difficulty has been experienced onaccount of the impossibility of winding the successive coils as closelytogether asthe necessities of the case demanded, it being foundimpossible under the ordinary mode of construction to arrange thesuccessive lines of teeth as closely together as desired.

The object of our invention is, mainly, to overcome this difficulty, andto admit of the successive coils being wound closely together, in orderto bring the lines of teeth in close proximity to each other; and thisresult we secure by substituting for the extended flange on the strip agroove formed therein, this construction permitting us to use thinnerstrips than usual, and consequently to make the grooves narrower andbring the successive coils closer together than could heretofore bedone.

Figure 1 represents an end elevation of our improved cylinder, showingone end of the strip uncoiled; Fig. 2, a longitudinal central section ofthesame; Fig. 3, a cross-section of the strip and cylinder on anenlarged scale;

Fig. 4, a modification of the same, which affords a better and moresecure fastening of the strip than usual, but which does not possessfully the advantages of the strip shown in the other figures.

In the drawing, A represents the roll or cylinder, provided with theusual groove or grooves a, and B represents the toothed strip or wire,having its outer edge notched or serrated to form a series of teeth, asusual, and having near its inner edge a continuous longitudinal grooveor indentation, b. The strip has its inner grooved edge inserted intothe grooves of the cylinder, as shown, and is secured by upsetting orforcing down the metal of the cylinder in such manner as to fill thegroove 11, as shown in Figs. 2 and 3.

As shown in Figs. 1, 2, and 3, the strip is made of uniform orsubstantiallyuniform thickness from the outer to the inner edges, sothat it is reduced in thickness at the point where the groove is formed.

When the strip is to be wound closely upon the cylinder there should beno projection or protuberance on the back opposite the groove.

It will be seen that, when constructed, as shown in Fig. 3, with thegroove in one side and the flat face 011 the other, the strip may beinserted into a very narrow groove in the cylinder, and thatconsequently the grooves of the cylinder and the successive coils ofwire may be brought very close together.

When the winding of the strip closely upon the cylinder is no object,the metal may be allowed to project on the side of the strip oppositethe groove, as shown in Fig. 4, so that, when secured within thecylinder it will be held not only by the metal engaging in the groove1), but also by the metal engaging over the protuberance or projection.The protuberance or rib on the rear side may be formed by forcing up themetal in the act of rolling the groove in the opposite side.

The strip thus constructed may be made at a less cost than those of theordinary form, and will be found to have an extremely firm hold in thecylinder.

In place of the continuous groove 1), a line of short indentations orgrooves may be employed; but it is preferred to make the groovecontinuous, as shown. The. groove 1) may be of a round or angular formin cross-section, as preferred.

Having thus described our invention, What we claim is-- 1. A toothedmetal strip for a burringcyl inder, constructed, as shown, with thegrooves or 1ndentations b in its side.

2. The flat toothed strip B, having on one side a flat or substantiallyflat side face, with

